to reduce something in amount, degree, strength etc, or to become less:
reduce[intransitive and transitive]
Do you think we should lower the price?
After 20 minutes lower the temperature to 325°.
drugs to lower blood pressure
Helen lowered her voice (=made it quieter) as they approached.
His voice lowered (=became quieter).
to move something down from higher up [≠ raise]:
Very gently, he lowered the dog onto the rug by the fire.
The flags were lowered to half-mast.
Greg watched as the coffin was lowered.
He lowered himself carefully down from the top of the wall.
to look down [≠ raise]:
Christina blushed and lowered her eyes.
to behave in a way that makes people respect you less:
lower yourself[usually in negatives]
I wouldn't lower myself to speak to her after what she's done.
to make something not as nice as it was:
They thought an influx of students would lower the tone of the neighborhood.
Trust you to lower the tone of the conversation (=include rude jokes etc in what you say)!
He leaned forward and spoke in a lowered voice.